Illinois home charging cost for the 2026 Rivian R1S Quad Max (20in AT)

A 2026 Rivian R1S Quad Max (20in AT) draws 50.1 kWh per 100 miles per the EPA; at Illinois's 19.22¢/kWh residential rate that's $9.63 per 100 miles charged at home, versus $16.02 for a 25.5-mpg gas car covering the same distance. Charging at home is cheaper than gas here: 39.9% less than gas per mile, here specifically.

What a year of driving costs

At fueleconomy.gov's default of 15,000 annual miles, the 2026 Rivian R1S Quad Max (20in AT) costs roughly $1,444 a year to charge at home in Illinois, against roughly $2,403 a year for an equivalent gas car. That's a savings of about $958 a year.

What one full charge costs

Covering the 2026 Rivian R1S Quad Max (20in AT)'s EPA-rated 325-mile range takes about 162.8 kWh, which costs about $31.3 at Illinois's residential rate — figured from the EPA's own combined range and consumption numbers, not the pack's nameplate capacity.

Where this ranks

This combination ranks 17,089 of 20,400 state/model pairs for cost savings against gas (1 is cheapest). The Rivian R1S Quad Max (20in AT) alone ranks 392 of 400 models for efficiency; Illinois alone ranks 36 of 51 states for electricity price.

Next step: home charger installation

The numbers above assume Level 2 home charging is already in place — the electrical work behind that is a real, separate cost that varies by panel, wiring, and local labor rates, not something this page's per-mile math includes.

Ask a licensed Illinois electrician to quote the install before this math becomes a real decision.

Where these figures come from

The methodology guide names the exact EIA and EPA tables behind this page's numbers. Curious how Illinois's 19.22¢/kWh compares? The guide to charging cost by state ranks every state side by side.